4,008 research outputs found
Lattice study of ((D)over-bar(1)D*)(+/-) near-threshold scattering
No full textIn this exploratory lattice study, low-energy near threshold scattering of the ((D) over bar D-1*)(+/-) meson system is analyzed using lattice QCD with N-f = 2 twisted mass fermion configurations. Both s-wave (J(P) = 0(-)) and p-wave (J(P) = 1(+)) channels are investigated. It is found that the interaction between the two charmed mesons is attractive near the threshold in both channels. This calculation provides some hints in the searching of resonances or bound states around the threshold of ((D) over bar D-1*)(+/-) system.National Science Foundation of China (NSFC) [11335001, 11275169, 11075167, 11105153, 11505132, 11261130311]; Deutsche Forschungsgemeinschaft (DFG); Scientific Research Program - Shanxi Provincial Education Department [15JK1348]SCI(E)[email protected]
Firm R&D, Absorptive Capacity and Learning by Exporting: Firm-level Evidence from China
No full textThe absorptive capacity of firms developed through R&D promotes learning by exporting. In this paper, we estimate the instantaneous and long-run productivity effects of exporting on the universe of Chinese manufacturing firms. We find that exporting has very different productivity effects for firms with different pre-export R&D status. It has large and lasting productivity effects for firms with pre-export R&D, while it has little effects for firms without pre-export R&D. Furthermore, the effect of exporting increases with the number of years of pre-export R&D investment.Business, FinanceEconomicsInternational RelationsSSCI0ARTICLE91131-11453
Form Factor of the Relativistic Two-Particle System in the Relativistic Quasipotential Approach: The Case of Arbitrary Masses and Scalar Current
No full textThe new relativistic form factor of the relativistic two-particle bound system in the case of scalar current is obtained. Consideration is conducted within the framework of relativistic quasipotential approach on the basis of covariant Hamiltonian formulation of quantum field theory by transition to the three-dimensional relativistic configurational representation in the case of two interacting relativistic particles with arbitrary masses
Form Factor for a Two-Particle System within a Relativistic Quasipotential Approach: Case of Arbitrary Masses and of a Vector Current
No full textA new relativistic form factor for a bound two-particle system was obtained for the case of avector current. The present consideration was performed within the relativistic quasipotential approachbased on the covariant Hamiltonian formulation of quantum field theory by going over to the three-dimensional relativistic configuration representation for the case of interaction between two relativisticspinless particles of arbitrary mass
Z(c)(3900) as a (D)over-barD* molecule from the pole counting rule
No full textA comprehensive study on the nature of the Zc(3900) resonant structure is carried out in this work. By constructing the pertinent effective Lagrangians and considering the important final-state-interaction effects, we first give a unified description to all the relevant experimental data available, including the J/psi pi and pi invariant mass distributions from the e(+)e(-) -> J/psi pi process, the h(c)pi distribution from e(+)e(-) -> h(c)pi pi, and also the D (D) over bar* spectrum in the e(+)e(-) -> D (D) over bar*pi process. After fitting the unknown parameters to the previous data, we search the pole in the complex energy plane and find only one pole in the nearby energy region in different Riemann sheets. Therefore, we conclude that Z(c)(3900) is of D (D) over bar* molecular nature, according to the pole counting rule method [Nucl. Phys. A543, 632 (1992); Phys. Rev. D 35, 1633 (1987)]. We emphasize that the conclusion based upon the pole counting method is not trivial, since both the D (D) over bar* contact interactions and the explicit Z(c) exchanges are introduced in our analyses andNational Nature Science Foundations of China (NSFC) [10925522, 11021092, 11575052, 11105038]; Natural Science Foundation of Hebei Province [A2015205205]; inoGerman Collaborative Research Center "Symmetries and the Emergence of Structure in QCD" [CRC 110]; DFG; NSFCSCI(E)ARTICLE119
Reconstructing a non-local separable interaction in the framework of the relativistic quasipotential model
No full textIn the framework of the relativistic quasipotential approach to the quantum field theory, a method is developed according to which a non-local separable quasipotential describing the interaction between two relativistic spinless particles of unequal masses can be reconstructed by of the phase shift and bound-state energies
On a Physical Relativization of the Strong Interaction within the Relativistic Quasipotential Approach
No full textNew relativistic Coulomb-like threshold resummation S- and L-factors in quantum chromodynamics are obtained. Consideration is performed within the framework of quasipotential approach in quantum field theory formulated in the relativistic configurational representation in the case of two particles of unequal masses
Relativistic Inverse Scattering Problem for a Sum of a Nonlocal Separable Quasipotentias
No full textA relativistic inverse problem is solved for the case when the total quasipotential simulating the interaction of two relativistic spinless particles of unequal masses is the superposition of a local quasipotential and a sum of nonlocal separable quasipotentials. The problem is investigated within the relativistic quasipotential approach to quantum field theory. The local component of total interaction is supposed to be known and it not admits bound states. It is shown that the nonlocal separable components of total interaction may be reconstructed if its the local component, the phase-shift additions and the true bound state energy are known
Form Factor of the Relativistic Two-particle System in the Relativistic Quasipotential Approach: The Case of Arbitrary Masses and Vector Current
No full textA new relativistic form factor for a bound two-particle system was obtained for the case of a vector current. The present consideration was performed within the relativistic quasipotential approach
based on the covariant Hamiltonian formulation of quantum field theory by going over to the three dimensional relativistic configuration representation for the case of interaction between two relativistic spinless particles of arbitrary mass
Form Factor of a Relativistic Two-Particle System within the Relativistic Quasipotential Approach: Case of an Arbitrary Masses and a Scalar Current
No full textA new relativistic form factor for a bound two-particle system was obtained for the case ofa scalar current. The respective analysis was performed within the relativistic quasipotential approachbased on a covariant Hamiltonian formulation of quantumfield theory by going over to a three-dimensionalrelativistic configuration representation for the case of the interaction of two relativistic spinless particlesthat have arbitrary masses
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